I have a home from the 1850s. Mixed knob and tube with parts that are updated romex. I lost power to 1/3 of the rooms. Power is coming in from the outside to box, from box to breakers, and out from each breaker. Have tested each outlet and fixture in the house and those that work are obviously hot and those that are not are receiving any electric. Didn't finish my electrical map when we moved in so not sure how many breakers the trouble lies on. Have check all GFCIs and that is not the issue. Any advice? Guidance?
Electrical – House electric not working
electrical
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OK, let's see if I can make this clear:
White from feed spliced to both whites from the romex cables.
Yellow from feed to yellow from switch.
Orange from switch to black from disposal.
Black from feed to black from DW.
Be sure to splice all grounds and a ground tail to the box, and put a blank cover on the box.
You have lost a phase. Your stove, once switched on, is backfeeding through the phase that isn't working. You are looking for a burnt lug or wiring probably in the meter base or panel. If you can't see any burnt or discoloring, you will need to turn off your stove and then check for voltage at the load side of all of your breakers.
You're looking for something like this.
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Many homes of this time frame had very few individual circuits and as you have found a mix of old and new wiring. With a large section not working it may be as simple as 1 conductor at a junction has failed. Tracing this may take quite a bit of time and or special equipment. I use a Greenlee CS 8000 circuit tracer it has a self powered transmitter that you can trace the wires through the walls and will locate the failure point. These are fairly expensive but you may be able to find a used one or factory second at a reasonable price but a tool like this may be a good one to have for future problems also. The CS 8000 works on both live circuits and dead. Other than that it will take tracing the wires back and the failure point could be in a wall or enclosed space the cs8000 will pinpoint it within a few inches.